Qt is a cross-platform application and UI framework. Using Qt, you can write web-enabled applications once and deploy them across desktop, mobile and embedded operating systems without rewriting the source code. Qt is most notably used in Google Earth, KDE, Opera, OPIE, VoxOx, Skype, VLC media player and VirtualBox.  Qt can also be used in several other programming languages via language bindings.

Features

• Intuitive C++ class library
• Portability across desktop and embedded operating systems
• Integrated development tools
• with cross-platform IDE
• High runtime performance and small footprint on embedded

Download

http://qt.nokia.com/downloads

Online Reference Documentation

http://doc.trolltech.com/